Mpow V4.1 Bluetooth Headphones Wireless Sport Headphones, Snug Fit in-Ear Running Earbuds with Mic-Black EXCELLENT SOUND: Combine wireless Bluetooth operation with built-in HD microphone to ensuring robust and clear sound, its excellent for music and phone call. COMFORTABLE FIT: With ergonomic design and soft silicone ear hook, this in-ear Bluetooth headphone fits perfectly even for all-day use. CVC 6.0 NOISE CANCELLATION: Built-in HD microphone and CVC6.0 noise cancellation for high quality, hands-free phone conversation. 8 HOURS BATTERY LIFE: Up to 8 hours continuous music playing time and last 300 hours standby time for meeting your needs when go out. Please note the playing time depends on your audio content and volume. UNIVERSAL COMPATIBILITY: Adopting Bluetooth 4.1, its easy for you to pair your smartphones, tablets and other bluetooth enabled devices up to 32-feet. If you cant connect or pair to your devices in any case, please read the FAQ guidance before judging them defective, you can find the solutions finally.